Buellia schaereri De Not.

Giorn. Bot. Ital., 2: 199, 1846.
Synonyms: Buellia destructans (Tobler) R. Sant.; Buellia nigritula (Nyl.) Mudd; Karschia destructans Tobler; Lecidea nigritula Nyl.
Distribution: N - VG, Frl, Ven (Nascimbene & Caniglia 2000, 2003c, Nascimbene & al. 2006e, Nascimbene & Marini 2007), TAA (Nascimbene 2006b, 2006c, 2008b, 2013, 2014, Nascimbene & al. 2006, 2006e, 2007b, 2009, 2010, 2014, Stofer 2006, Nimis & al. 2015, Trindade & al. 2021), Lomb, Piem (Isocrono & al. 2004), Emil (Nimis & al. 1996, Fariselli & al. 2020), Lig (TSB 33052). C - Tosc (Putortì & Loppi 1999, Brunialti & Frati 2010, Brunialti & al. 2012b), Marc (Nimis & Tretiach 1999), Laz, Abr (Nimis & Tretiach 1999), Mol (Nimis & Tretiach 1999, Caporale & al. 2008). S - Camp (Aprile & al. 2002, 2003b, Nimis & Tretiach 2004, Garofalo & al. 2010), Cal (TSB 13945).
Description: Thallus crustose, often almost entirely hidden in the substrate, sometimes thinly episubstratic and rimose, appearing as a greyish white to olive brown patch. Medulla I-. Apothecia lecideine (0.1-)0.2-0.3(-0.5) mm across, soon sessile, with a black, epruinose, at first flat then soon convex disc, and a thin, soon excluded proper margin. Proper exciple narrow, poorly differentiated, aethalea-type, the inner hyphae hyaline, prosoplectenchymatous, the outer hyphae parallel and usually strongly brown-pigmented; epithecium brown, N-; hymenium colourless, 35-60 µm high, not inspersed with oil droplets; paraphyses simple to moderately branched, apically swollen, with a brown pigment cap; hypothecium dark reddish brown. Asci 8-spored, clavate, Bacidia-type. Ascospores 1-septate, soon brown, ellipsoid with obtuse ends, not constricted at septum, 6-10(-12) x 2.5-4(-4.5) µm, Buellia-type, thin-walled throughout, the wall not ornamented. Pycnidia often numerous, globose, unilocular. Conidia very short, oblong to ellipsoid, some of them almost globose, 1.5-3 x 0.5-1(-1.4) µm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a mainly cool-temperate to boreal-montane, circumpolar species found on acid bark, especially of conifers, and on wooden poles in upland areas, to be looked for further in the mountains of southern Italy.
Growth form: Crustose
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: rather common
Oromediterranean belt: absent
Montane belt: rather rare
Submediterranean belt: very rare
Padanian area: absent
Humid submediterranean belt: very rare
Humid mediterranean belt: absent
Dry mediterranean belt: absent

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model
Herbarium samples

P.L. Nimis CC BY-SA 04
TSB 13376

Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php (Courtesy: Anita Stridvall)

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (13376)